greenplumn CParseHandlerScalarSubPlanTestExpr 代码
文件路径：/src/backend/gporca/libnaucrates/src/parser/CParseHandlerScalarSubPlanTestExpr.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2014 VMware, Inc. or its affiliates.
/
/ @filename:
/ CParseHandlerScalarSubPlanTestExpr.cpp
/
/ @doc:
/ Implementation of the SAX parse handler class for parsing subplan test expression
/---------------------------------------------------------------------------
#include "naucrates/dxl/parser/CParseHandlerScalarSubPlanTestExpr.h"
#include "naucrates/dxl/operators/CDXLOperatorFactory.h"
#include "naucrates/dxl/parser/CParseHandlerFactory.h"
#include "naucrates/dxl/parser/CParseHandlerScalarOp.h"
using namespace gpdxl;
XERCES_CPP_NAMESPACE_USE
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerScalarSubPlanTestExpr::CParseHandlerScalarSubPlanTestExpr
/
/ @doc:
/ Ctor
/
/---------------------------------------------------------------------------
CParseHandlerScalarSubPlanTestExpr::CParseHandlerScalarSubPlanTestExpr(
CMemoryPool *mp, CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root)
: CParseHandlerScalarOp(mp, parse_handler_mgr, parse_handler_root),
m_dxl_test_expr(nullptr)
{
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerScalarSubPlanTestExpr::~CParseHandlerScalarSubPlanTestExpr
/
/ @doc:
/ Dtor
/
/---------------------------------------------------------------------------
CParseHandlerScalarSubPlanTestExpr::~CParseHandlerScalarSubPlanTestExpr()
{
CRefCount::SafeRelease(m_dxl_test_expr);
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerScalarSubPlanTestExpr::StartElement
/
/ @doc:
/ Processes a Xerces start element event
/
/---------------------------------------------------------------------------
void
CParseHandlerScalarSubPlanTestExpr::StartElement(
const XMLCh *const element_uri, const XMLCh *const element_local_name,
const XMLCh *const element_qname, const Attributes &attrs)
{
if (0 != XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenScalarSubPlanTestExpr),
element_local_name))
{
/ install a scalar element parser for parsing the test expression
CParseHandlerBase *child_parse_handler =
CParseHandlerFactory::GetParseHandler(
m_mp, CDXLTokens::XmlstrToken(EdxltokenScalar),
m_parse_handler_mgr, this);
m_parse_handler_mgr->ActivateParseHandler(child_parse_handler);
/ store parse handler
this->Append(child_parse_handler);
child_parse_handler->startElement(element_uri, element_local_name,
element_qname, attrs);
}
}
/---------------------------------------------------------------------------
/ @function:
/ CParseHandlerScalarSubPlanTestExpr::EndElement
/
/ @doc:
/ Processes a Xerces end element event
/
/---------------------------------------------------------------------------
void
CParseHandlerScalarSubPlanTestExpr::EndElement(
const XMLCh *const, / element_uri,
const XMLCh *const element_local_name,
const XMLCh *const / element_qname
)
{
if (0 != XMLString::compareString(
CDXLTokens::XmlstrToken(EdxltokenScalarSubPlanTestExpr),
element_local_name) &&
nullptr != m_dxl_test_expr)
{
CWStringDynamic *str = CDXLUtils::CreateDynamicStringFromXMLChArray(
m_parse_handler_mgr->GetDXLMemoryManager(), element_local_name);
GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiDXLUnexpectedTag,
str->GetBuffer());
}
if (0 < this->Length())
{
CParseHandlerScalarOp *child_parse_handler =
dynamic_cast<CParseHandlerScalarOp *>((*this)[0]);
if (nullptr != child_parse_handler->CreateDXLNode())
{
m_dxl_test_expr = child_parse_handler->CreateDXLNode();
m_dxl_test_expr->AddRef();
}
}
/ deactivate handler
m_parse_handler_mgr->DeactivateHandler();
}
/ EOF
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